/// <devdoc>
/// Initializes this image for the first time. This should only be called once.
/// </devdoc>
private void Initialize(SafeNativeMethods.IPicture picture)
{
if (this.picture != null)
{
throw new InvalidOperationException(SR.GetString(SR.IllegalState, GetType().Name));
}
this.picture = picture;
// SECUNDONE : Assert shouldn't be needed, however we can't put SuppressUnmanagedCode
// : on the IPicture interface, so we must do an Assert.
//
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert();
try {
if (picture != null && picture.GetPictureType() == NativeMethods.Ole.PICTYPE_ICON)
{
handle = picture.GetHandle();
ownHandle = false;
}
else
{
throw new ArgumentException(SR.GetString(SR.InvalidPictureType,
"picture",
"Cursor"), "picture");
}
}
finally {
CodeAccessPermission.RevertAssert();
}
}
/// <include file='doc\COM2PictureConverter.uex' path='docs/doc[@for="Com2PictureConverter.ConvertNativeToManaged"]/*' />
/// <devdoc>
/// Converts the native value into a managed value
/// </devdoc>
public override object ConvertNativeToManaged(object nativeValue, Com2PropertyDescriptor pd)
{
if (nativeValue == null)
{
return(null);
}
Debug.Assert(nativeValue is SafeNativeMethods.IPicture, "nativevalue is not IPicture");
SafeNativeMethods.IPicture nativePicture = (SafeNativeMethods.IPicture)nativeValue;
IntPtr handle = nativePicture.GetHandle();
if (lastManaged != null && handle == lastNativeHandle)
{
return(lastManaged);
}
lastNativeHandle = handle;
//lastPalette = nativePicture.GetHPal();
if (handle != IntPtr.Zero)
{
switch (nativePicture.GetPictureType())
{
case NativeMethods.Ole.PICTYPE_ICON:
pictureType = typeof(Icon);
lastManaged = Icon.FromHandle(handle);
break;
case NativeMethods.Ole.PICTYPE_BITMAP:
pictureType = typeof(Bitmap);
lastManaged = Image.FromHbitmap(handle);
break;
default:
Debug.Fail("Unknown picture type");
break;
}
pictureRef = new WeakReference(nativePicture);
}
else
{
lastManaged = null;
pictureRef = null;
}
return(lastManaged);
}
/// <include file='doc\COM2PictureConverter.uex' path='docs/doc[@for="Com2PictureConverter.ConvertManagedToNative"]/*' />
/// <devdoc>
/// Converts the managed value into a native value
/// </devdoc>
public override object ConvertManagedToNative(object managedValue, Com2PropertyDescriptor pd, ref bool cancelSet)
{
// don't cancel the set
cancelSet = false;
if (lastManaged != null && lastManaged.Equals(managedValue) && pictureRef != null && pictureRef.IsAlive)
{
return(pictureRef.Target);
}
// we have to build an IPicture
lastManaged = managedValue;
if (managedValue != null)
{
Guid g = typeof(SafeNativeMethods.IPicture).GUID;
NativeMethods.PICTDESC pictdesc = null;
bool own = false;
if (lastManaged is Icon)
{
pictdesc = NativeMethods.PICTDESC.CreateIconPICTDESC(((Icon)lastManaged).Handle);
}
else if (lastManaged is Bitmap)
{
pictdesc = NativeMethods.PICTDESC.CreateBitmapPICTDESC(((Bitmap)lastManaged).GetHbitmap(), lastPalette);
own = true;
}
else
{
Debug.Fail("Unknown Image type: " + managedValue.GetType().Name);
}
SafeNativeMethods.IPicture pict = SafeNativeMethods.OleCreatePictureIndirect(pictdesc, ref g, own);
lastNativeHandle = pict.GetHandle();
pictureRef = new WeakReference(pict);
return(pict);
}
else
{
lastManaged = null;
lastNativeHandle = lastPalette = IntPtr.Zero;
pictureRef = null;
return(null);
}
}